GRPC update (#69)

Bug Fix for K8s v25
I have replicated this error on the newest version of kubernetes v25.3 with CRI-O runtime.
The error is due to the order of initializing grpc with kubelet. Newest version of kubelet requires grpc to first start and then register a session.
I've also tested the reordering of the grpc functions with older version of k8s (22.5) which works as expected.

internal/deviceplugin/poolManager.go

@@ -82,16 +82,16 @@ func (pm *PoolManager) Init(config PoolConfig) error {
 	pm.BpfHandler = bpf.NewHandler()
 	pm.NetHandler = networking.NewHandler()
 
+        if err := pm.startGRPC(); err != nil {
+                return err
+        }
+        logging.Infof("Pool "+pm.DevicePrefix+"/%s started serving", pm.Name)
+
 	if err := pm.registerWithKubelet(); err != nil {
 		return err
 	}
 	logging.Infof("Pool "+pm.DevicePrefix+"/%s registered with Kubelet", pm.Name)
 
-	if err := pm.startGRPC(); err != nil {
-		return err
-	}
-	logging.Infof("Pool "+pm.DevicePrefix+"/%s started serving", pm.Name)
-
 	if len(pm.Devices) > 0 {
 		pm.UpdateSignal <- true
 	}